My Inquiry
My Account
Analog Devices Inc./Maxim Integrated LM4040CIX3-2.5
- Part No.:
- LM4040CIX3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-2.5.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:548
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040CIX3-2.5 from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±10 mV initial tolerance (0.5% grade), ±15 ppm/°C temperature coefficient over –40°C to +85°C, 60 µA to 15 mA operating current range, and 35 µVRMS wideband noise (10 Hz–10 kHz). It delivers stable regulation in portable battery-powered systems requiring minimal board space and low quiescent current.
For engineers reviewing the LM4040CIX3-2.5 datasheet, LM4040CIX3-2.5 pinout, LM4040CIX3-2.5 application, or LM4040CIX3-2.5 equivalent, this page provides verified specifications, SC70-3 terminal mapping, real-world use scenarios in notebook computers and industrial controls, and validated alternative options for voltage reference selection.
Technical Context
The LM4040CIX3-2.5 implements a bandgap-based shunt reference architecture with laser-trimmed resistors for precise initial accuracy. Its operation requires only reverse bias current (60 µA–15 mA) between cathode and anode to maintain stable 2.500 V output - no external capacitor needed for stability, even with capacitive loads.
It exhibits low dynamic impedance (≤0.9 Ω at 1 mA), tight thermal drift (±15 ppm/°C), and long-term stability of 120 ppm over 1000 hours. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2 per datasheet guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal; guaranteed 2.4875 V to 2.5125 V at +25°C (C-grade) |
| Initial Accuracy | ±10 mV (0.5%) at +25°C; enables high-precision ADC/DAC biasing without calibration |
| Tempco | ±15 ppm/°C over –40°C to +85°C; ensures ≤±1.15% total error across full temperature range |
| Operating Current | 60 µA to 15 mA; supports micropower sensor nodes and higher-current analog subsystems |
| Dynamic Impedance | ≤0.9 Ω at 1 mA; maintains voltage stability under fast load transients |
| Output Noise | 35 µVRMS (10 Hz–10 kHz); suitable for low-noise instrumentation and precision measurement |
| Long-Term Stability | 120 ppm after 1000 hours; reduces recalibration frequency in field-deployed equipment |
Pinout & Package
LM4040CIX3-2.5 is housed in a 3-pin SC70 surface-mount package (1.8 mm × 1.8 mm), 50% smaller than SOT23-3. Pin 3 is not connected and must remain floating or be tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to supply rail through series resistor |
| 2 (−) | Anode | Reference ground node; ties to system ground or load return path |
| 3 (N.C.) | No Connection | Must be left unconnected or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8 mm × 1.8 mm area saves >50% PCB space vs. SOT23-3 equivalents |
| No output capacitor required | Stable with any capacitive load; eliminates BOM cost and layout constraints |
| Wide shunt current range | Operates reliably from 60 µA (micropower sleep mode) to 15 mA (high-drive applications) |
| Low wideband noise | 35 µVRMS (10 Hz–10 kHz) supports high-resolution data acquisition systems |
| Laser-trimmed accuracy | 0.5% grade achieved via on-die resistor trimming; avoids post-assembly calibration |
Applications
| Portable Medical Sensors | Notebook Computer Power Management |
|---|---|
Use Scenario: Reference for 16-bit SAR ADC measuring ECG signal amplitude in wearable patch monitors. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.500 V reference for ADC VREF input. Use Value: 0.5% initial accuracy and ±15 ppm/°C tempco ensure <0.05% full-scale error across body-temperature range (32–42°C). | Use Scenario: Precision feedback reference for buck converter regulating CPU core voltage. IC Role / Device Role / Timing Role: Two-terminal shunt reference setting regulated output voltage via resistor divider feedback. Use Value: Stable 2.500 V output with 60 µA minimum current enables accurate regulation even during deep-sleep states. |
| Industrial Process Transmitters | Smart Energy Metering Modules |
Use Scenario: Reference for 24-bit delta-sigma ADC converting 4–20 mA loop current to digital output. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end signal conditioning chain. Use Value: 120 ppm long-term stability minimizes calibration drift over 10-year field deployment in harsh environments. | Use Scenario: Reference for metrology-grade ADC sampling AC mains voltage and current waveforms. IC Role / Device Role / Timing Role: Low-noise shunt reference supplying VREF to isolated sigma-delta modulator. Use Value: 35 µVRMS noise floor preserves ENOB >18 bits in 10 kHz bandwidth measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable output (2.5 V min), 0.5% initial accuracy, 100 ppm/°C tempco, SOT23-3 | Requires two external resistors for 2.5 V setting; higher minimum cathode current (80 µA) | Choose when design flexibility for multiple reference voltages is needed; verify layout compatibility with SOT23-3 footprint |
| MAX6008AEUR+T | Fixed 2.5 V, 0.2% initial accuracy, 50 ppm/°C tempco, SOT23-3 | Higher accuracy and lower tempco but larger minimum current (100 µA) and higher cost | Choose when tighter initial tolerance and thermal stability are critical, and 100 µA minimum current is acceptable |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040CIX3-2.5 offers the smallest SC70-3 footprint and lowest minimum operating current (60 µA), making it optimal for ultra-compact, battery-constrained designs where fixed 2.5 V is sufficient and sub-0.5% accuracy meets system requirements.
Availability
LM4040CIX3-2.5 is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power management, industrial process transmitters, and smart energy metering modules requiring stable component supply and long-lifecycle support.
Supply support for LM4040CIX3-2.5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated systems requiring stable reference performance across wide temperature ranges.
FAQ
What is the maximum operating current for LM4040CIX3-2.5?
The absolute maximum reverse current for LM4040CIX3-2.5 is 20 mA, but its specified operating range is 60 µA to 15 mA. Exceeding 15 mA may cause excessive power dissipation beyond the 174 mW limit of the SC70-3 package at +70°C. For reliable long-term operation, keep shunt current ≤15 mA and ensure junction temperature remains below +150°C.
Does LM4040CIX3-2.5 require an external capacitor for stability?
No, LM4040CIX3-2.5 does not require an external output capacitor and remains stable with any capacitive load. This eliminates BOM cost and layout sensitivity, enabling direct connection to ADC reference inputs or feedback nodes without added components - a key advantage over many series references.
What is the function of pin 3 on LM4040CIX3-2.5?
Pin 3 of LM4040CIX3-2.5 is labeled N.C. (No Connection) and is not internally bonded. The datasheet explicitly states it must be left floating or connected to pin 2 (anode). Incorrect routing or tying to other nets may compromise device reliability or violate absolute maximum ratings.
How does LM4040CIX3-2.5 achieve its 0.5% initial accuracy?
LM4040CIX3-2.5 achieves ±10 mV (0.5%) initial accuracy at +25°C through factory laser trimming of on-chip resistors during final test. This process adjusts the bandgap core's output without requiring external calibration, ensuring consistent 2.500 V performance across production lots and eliminating post-assembly trimming steps.
Can LM4040CIX3-2.5 be used in place of a Zener diode?
Yes, LM4040CIX3-2.5 functions as a precision, two-terminal shunt reference analogous to a Zener diode but with superior performance: tighter voltage tolerance (±10 mV vs. ±5%), lower tempco (±15 ppm/°C vs. ±100 ppm/°C typical), and guaranteed stability without external capacitance. It replaces standard Zeners in applications demanding accuracy, low noise, and predictable thermal behavior.
LM4040CIX3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CIX3-2.5 FAQ
1.How can I place an order for LM4040CIX3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-2.5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM4040CIX3-2.5 reliable?
The price and inventory of LM4040CIX3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-2.5?
LM4040CIX3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-2.5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM4040CIX3-2.5?
For technical support, including LM4040CIX3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-2.5 requirements.
6.How does Aetrix verify that LM4040CIX3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-2.5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4040CIX3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-2.5?
All LM4040CIX3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-2.5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM4040CIX3-2.5 part is unused and in its original packaging.
Return procedure for LM4040CIX3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIX3-2.5 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
